You certainly can detect microemboli on an extracranial study. I don't think there is literature that discusses extracranial detection rate, etc. namely because embolic detection is dependent on the frequency of the transducer. The lower the frequency, the more emboli you will detect (if there is emboli present).
One interesting question would be if the patient had a valve replacement, as these are shown to shed air emboli, which produce a higher signal to noise ratio compared to particulate matter. If you found embolic signals on both sides that would confirm the central source.
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